oops zipkin proto support missing :)

[codefromthecrypt]

POST /api/v2/spans endpoint if content type is application/x-protobuf use SpanBytesDecoder.PROTO3

https://github.com/openzipkin/zipkin-api/blob/master/zipkin.proto

[worldtiki]

Yes it is, thanks for the heads up :)

Draft here: #10

I didn't have time to do any sort of testing. I'll work on it later this week.

[worldtiki]

Implemented in #10